It's difficult for him to keep track of time since he has no watch.
让他说出确切的时间是困难的,因为他没有手表。
Don't forget to pack something to let you keep track of time, like a watch.
不要忘了准备计时工具,例如手表。
For each user account, I keep track of time used, along with other information.
对于每个用户帐户,我跟踪使用的时间,以及其他信息。
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